Top new questions this week:
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In the 1980s, each country had a particular brand of computer that was most commonly used in schools; often, there was pressure to go with a local manufacturer. In the US, the Apple II. In Britain, ...
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I have several 286, 386 and 486 motherboards that I would like to use. My problem is that while I have all of the components to make them functional, I don't have spare cases to put them in. ...
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Usually when talking about two-phase clocks in early CPUs, one means this type of clock, that consists of two non-overlapped pulses.
Examples are MC6800 clock (page 3) or i8080 clock (page 6).
Many ...
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ARM Linux, at least Debian was traditionally (pre eabi) built for the FPA floating point unit*. Unfortunately under old ABI it was not easily possible to mix soft-float code with FPA code. The result ...
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I'm trying to find an early to mid 90s Macintosh game.
It was a side scrolling shooter in the style of R Type.
You flew a spaceship that looked vaguely like the USS Enterprise from Star Trek, albeit ...
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I am curently studying NES architecture to create a NES emulator. While looking up the NES motherboard schematics (https://console5.com/wiki/Nintendo_NES-001), some of the chips usage are not clear to ...
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I'd like to bring up an old (pre-1975) LISP REPL so I can type things in and see how it behaves. MACLISP would be good but I'm open to other, similar LISPs, even as far back as LISP 1.5.
What's the ...
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Greatest hits from previous weeks:
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I'm using the cpudiag.bin from http://www.emulator101.com/files/cpudiag.bin to test my emulator. I've already implemented the CP/M CALL function at 0x05, offset the program at 0x100 and fixed the ...
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When I began high school in 1987 all the computers in the lab were Apple IIe desktop computers. A question has haunted me since then:
if you inserted a floppy disk "upside down" the Apple IIe would ...
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The Unix designers came from the GE/MIT Multics project, and Multics inspired some Unix features. In particular, Multics has a hierarchical filesystem, and so does Unix.
On Multics, pathnames were of ...
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There are a lot of retro-computers with BASIC as an integral part of the operating system. The IBM 5100 was one of the first computers with a separate memory space for BASIC, followed by the Commodore ...
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While early microcomputers used analog video outputs (often to use a television as a display), higher end machines such as the BBC Micro or Commodore 128 supported a digital RGB (or RGBI) video ...
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In MS-DOS (and FAT16), you could only have 8.3 file names (like QUESTION.TXT) with only single-case letters and numbers (and a few symbols). The MS-DOS Editor also defaulted to 8.3 - typing edit ...
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I'm studying the 65c816 assembly for the 1994 game, Super Metroid.
A hobbyist studied the game in-depth and created a RAM map. From it:
7E:0B56 - 7E:0B57 Moves Samus this distance horizontally, ...
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Can you answer these questions?
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On the Apple IIe system, an "auxiliary RAM" card may be present which expands the built-in 64 kB RAM.
When using an aux RAM card which has more than 64 kB, the auxiliary RAM bank in use can be ...
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How much control over the TRS-80 Model III's floppy drive controller can be effected via relatively simple commands, typed into its built-in Cassette BASIC?
My understanding is that general usage of ...
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If the NMI line goes from high to low when the RDY is low, is the NMI detected, so that when RDY goes high, NMI is performed ?
Or is the NMI discarded when it occurs when RDY is low ?
(In case of ...
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